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GROUNDWATER TECHNOLOGY, INC. STANDARD OPERATING PROCEDURE CONCERNING WATER SAMPLING METHODOLOGY SOP 9 Before water sampling, each well shall be purged by pumping a minimum of four well volumes or, where required by the client and/or local implementing agency, until the discharge water indicates stabilization of temperature, conductivity, pH and turbidity. If the well is evacuated before four well volumes are removed or stabilization is achieved, the sample should be taken when the water level in the well recovers to 80 percent of its initial level. Retrieval of the water sample, sample handling and sample preservation shall be conducted according to Standard Operating Procedure 10 concerning "Sampling for Volatiles in Water." The sampling equipment used shall consist of a Teflon® and/or stainless steel samplers which meet U.S. Environmental Protection Agency (EPA) regulations. Glass vials with Teflon4l lids should be used to store the collected samples. To ensure sample integrity, each vial shall be filled with the sampled water in such a way that the water stands above the lip of the vial. The cap should then be quickly placed on the vial and tightened securely. The vial should then be checked to ensure that air bubbles are not present prior to labeling of the sample. Label information should include a sample identification number, job identification, date, time, type of analysis requested, and sampler's name. Chain -of -custody records shall be completed by the sampler. Each time the custody of samples is transferred from one person to another, each transferer and recipient must date, sign and note the time on the chain -of - custody form. The vials should be immediately placed in high quality coolers for shipment to the laboratory. The coolers should be packed with sufficient ice or freezer packs to ensure that the samples are kept below 4° Celsius (C). To minimize sample degradation the prescribed analysis shall take place within seven days of sample collection unless specially prepared acidified vials are used. To minimize the potential for cross contamination between wells, all the well development and water sampling equipment which contacts the groundwater shall be cleaned between each sampling. As a second precautionary measure, the wells shall be sampled in order of increasing contaminant concentrations (the least contaminated well first, the most contaminated well last) as established by previous analysis. C� GROUNDWATER TECHNOLOGY